Allow to use cg_gcc path in bootstrap clippy command

Author: GuillaumeGomez

src/bootstrap/src/core/build_steps/clippy.rs

@@ -343,7 +343,7 @@ impl Step for CodegenGcc {
     type Output = ();
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.alias("rustc_codegen_gcc")
+        run.alias("rustc_codegen_gcc").path("compiler/rustc_codegen_gcc")
     }
 
     fn make_run(run: RunConfig<'_>) {

src/bootstrap/src/core/builder/tests.rs

@@ -2763,6 +2763,10 @@ mod snapshot {
                 .render_steps(), @r"
         [build] llvm <host>
         [clippy] rustc 0 <host> -> rustc 1 <host>
+        [check] rustc 0 <host> -> rustc 1 <host>
+        [clippy] rustc 1 <host> -> rustc 2 <host>
+        [check] rustc 1 <host> -> rustc 2 <host>
+        [clippy] rustc 1 <host> -> rustc_codegen_gcc 2 <host>
         ");
     }